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ICO Converter

Convert ICO files to and from other formats with our free online tool.

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About ICO (Icon)

Technical specifications and use cases

ICO is a container format for computer icons, primarily used in Microsoft Windows. It can contain multiple sizes of the same image and supports transparency. ICO files are typically small and optimized for quick loading. They're essential for Windows applications and websites that need to display custom icons. ICO is the standard format for Windows system icons and application icons.

Compression

Container format with image compression

Quality

Optimized for small sizes, multiple resolutions

Popular for

Windows icons, application icons, website favicons, system icons

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